A psychometrician is a person who has been specially trained to administer and score psychometric instruments such as IQ tests, achievement tests, and personality inventories. Once trained, a psychometrician is better able to interpret test results than an untrained worker. The title of psychometrician is generally a specialized area of psychology that requires additional training in addition to the basic degree in psychology. This training involves the use of a wide spectrum of tests (IQ, aptitude, personality) along with a solid background in the statistical testing background that goes with scoring and evaluating results.